What does iridodonesis indicate during an examination?

Iridodonesis refers to the tremulousness or oscillation of the iris, which is often observed during a clinical examination. This sign indicates that there is some instability or lack of support for the lens within the eye. When the lens is dislocated or subluxated, it can lose its normal positioning, which causes the iris to move in an unusual manner, leading to the characteristic motion known as iridodonesis.

The presence of iridodonesis suggests that the suspension structures of the lens, such as the zonules, have been compromised, allowing for this abnormal movement. It is an important clinical sign that helps veterinarians determine the status of the lens and can be associated with conditions such as lens luxation or other forms of instability in the eye. Recognizing iridodonesis can lead to further investigation and management of underlying ocular conditions.

Options regarding stable lens positioning, presence of ocular inflammation, or normal pupil reactivity relate to other aspects of ocular health and do not specifically indicate the lens instability that is highlighted by the presence of iridodonesis.